Steven Joyce is playing down speculation National could be about to change its leader.

Newstalk ZB political editor Barry Soper said there are rumblings that Bill English may step down as early as next week.

But Joyce, National's campaign manager, told Mike Hosking Soper is completely wrong.

"This is classic first day journalists who will speculate on National Party leadership, job done. The leader actually has the support of the whole caucus."

Joyce said English proved himself by getting the highest party vote at last year's election.

He believes that the first polls of the year will show English ahead of Prime Minister Jacinda Ardern.

He was joined on air by Stuart Nash, as the two discussed the week's political headlines as well as Joyce's musical past.